Precious stone



FIG. 1 is a top view of a precious stone showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a first perspective view thereof; and,

FIG. 6 is a second perspective view thereof. 

An ornamental design for a precious stone, as shown and described. 